A rebuke for wearing jeans at the wedding? (8,4)
I believe the answer is:
dressing down
'a rebuke' is the definition.
(dressing down is a kind of rebuke)
'wearing jeans at the wedding?' is the wordplay.
I cannot quite understand how this works, but
'wearing' could be 'in' (you are 'in' the clothes you're wearing) and 'in' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
'for' acts as a link.
Can you help me to learn more?
(Other definitions for dressing down that I've seen before include "telling-off" , "Severe scolding (wearing casual clothes?)" , "using low gear?" , "Severe scolding (in old clothes?)" , "rebuke" .)