Annual account about chap in Los Angeles (7)
I believe the answer is:
almanac
'annual' is the definition.
(I know that almanac is a type of annual)
'account about chap in los angeles' is the wordplay.
'account' becomes 'ac' (abbreviation for account).
'about' is an insertion indicator.
'chap' becomes 'man' (chap can mean a man).
'in' means one lot of letters goes inside another.
'los angeles' becomes 'LA' (abbreviation).
'man' placed inside 'la' is 'lmana'.
'ac' going around 'lmana' is 'ALMANAC'.
(Other definitions for almanac that I've seen before include "Statistical annual" , "Calendar with detailed information" , "Annual reference book" , "issue every year" , "Annual containing information, Old Moore's say" .)