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[creamegg]

1a- cool cat kind of pants
h?p?t?r - hipster? if so, why?


16d- agent on top of building receiving admonishment
r?p?o?f - reproof? if so, why?

18d- finish with unusually sore back
e?d?r?e endorse? why?

[EGTB]

16d -Agent =rep(representative) Roof =top of building -Reproof
18d Finish +end - orse anagram of Sore -Endorse
1a If hip you could be described as a Cool cat + hipster is a style of pants

[OAP60]

1a In my day cool cats wore hipsters!
16d Rep is the agent ,roof is top of the building and the whole word is an admonishment.
Finish is end and orse is anag of sore and endorse is to back something.

[laurababy]

1a hip is cool

rep is an agent

finish to end anagram of sore

[creamegg]

thankyou for explaining them to me, much appreciated xxx