Stronghold needed to keep hair in? (8)
I believe the answer is:
fortress
'stronghold' is the definition.
(I know that fortress is a type of citadel)
'to keep hair in?' is the wordplay.
I cannot really understand how this works, but
'to' could be 'for' and 'for' is found within the answer.
'hair' could be 'tress' (tress is a kind of hair) and 'tress' is found in the answer.
No letters remain.
This explanation may well be incorrect...
'needed' acts as a link.
Can you help me to learn more?
(Other definitions for fortress that I've seen before include "Strong point" , "Protective structure" , "Military stronghold" , "Castle" , "Place that's secure" .)