Police chief (female) wears an item of footwear for Sasquatch (7)
I believe the answer is:
bigfoot
'sasquatch' is the definition.
(synonyms)
'police chief female wears an item of footwear' is the wordplay.
'police chief' becomes 'ig' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'female' becomes 'f' (common abbreviation).
'wears' means one lot of letters goes inside another.
'an item of footwear' becomes 'boot' (I've seen this before).
'ig'+'f'='igf'
'igf' placed inside 'boot' is 'BIGFOOT'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for bigfoot that I've seen before include "American 'apeman'" , "Supposed American ape" , "Fabled hairy primate" , "Supposed NW US ape-like creature" , "Supposed ape of northwest US" .)