1
Perennial outsiders (7) : MSFTS
2
Reads a clock (5,4) : TLLSTM
3
Traffic problem during rush hour (10) : CNGSTN
4
Amscray (8,2) : HGHTLT
5
One recently born (7) : NNT
6
Encourages (4,2) : GGSN
7
Virtuous (7) : THCL
8
Seeking validation, in a way (7,3,11) : FSHNGFRCMPLMNTS
9
Where Leonardo's "Mona Lisa" hangs (3,6) : THLVR
10
Classic Volkswagens (7) : BTLS
11
Leaves in liquid (5) : SKS
12
Website whose ratings are sometimes accompanied by green splats (6,8) : RTTNTMTS
13
Lower part of a two-piece bathing suit (6,6) : BKNBTTM
14
Separates oneself (from) (10) : DSNGGS
21
Watching a pooch while the owner's away (3-7) : DGSTTNG
24
Sneaker (6,4) : TNNSSH
26
Cry upon arriving after a long trip (2,4,2) : WMDT
28
"Sorry, that didn't work out" (2,4,4) : NSCHLCK
29
___ ray tube (part of an old television) (7) : CTHD
31
Potential indicator of carpal tunnel syndrome (5,4) : WRSTPN
33
Add one's two cents (5,2) : CHMN
34
High-tech mechanisms of identity verification (7,5) : RTNLSCNS
35
Pointers (6) : RRWS
36
Where some people do the heavy lifting? (6,5) : WGHTRMS
37
Thick-cut starchy side dish (5,5) : WDGFRS
39
"I stand by all my previous decisions" (2,7) : NRGRTS
40
1960s TV parody centered around Agents 86 and 99 (3,5) : GTSMRT
41
Leprechaun's clover (8) : SHMRCK
44
Place to buy croissants and macarons (10) : PTSSR
46
Breakfast pastries (8) : DNSHS
48
"See you then!" (3,1,4) : TSDT
49
Parts of printing presses (6) : NKRS
50
Bulb holder (6) : SCKT
53
Museum handout held up to one's ear (5,5) : DGD
55
"Not one more peep from you!" (4) : HSH