Sort of crack chaps hope will not recede (8)
I believe the answer is:
hairline
This clue might be a double definition.
'sort of crack' is the first definition.
'hairline' can be an answer for 'crack' (I have seen 'Thin crack ' mean 'hairline' so perhaps 'crack' could also mean 'hairline'). I am unsure of the 'sort of' bit.
'chaps hope will not recede' is the second definition.
I know that 'recede' relates to this answer.
Can you help me to learn more?
(Other definitions for hairline that I've seen before include "A very narrow crack, a little hirsute?" , "Of a crack, very thin" , "Very narrow opening" , "area on the outskirts of Barnet?" , "extremely thin" .)