Clear about resort (8)
I believe the answer is:
brighton
'resort' is the definition.
(seaside resort)
'clear about' is the wordplay.
'clear' becomes 'bright' (as in a clear or bright day).
'about' becomes 'on' (as in a book 'on' a certain topic).
'bright'+'on'='BRIGHTON'
(Other definitions for brighton that I've seen before include "Resort on the south coast of England" , "... hard cylindrical sweet from the seaside" , "East Sussex resort" , "resort town" , "South coast city combined with Hove" .)