100 daguerreotypes? They're cool (4,5)
I believe the answer is:
cold snaps
'100 daguerreotypes?' is the definition.
Although both the answer and definition are plural nouns, I don't see how one could define the other.
'cool' is the wordplay.
I cannot quite see how this works, but
'cool' could be 'cold' (associated in meaning) and 'cold' is found in the answer.
The remaining letters 'snaps' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'they're' acts as a link.
Can you help me to learn more?
(Other definitions for cold snaps that I've seen before include "Biting Times" , "Chilly times" , "[FRAPPE] spells?" .)