Clothes are brought in by computer manufacturer mostly (7)
I believe the answer is:
apparel
'clothes' is the definition.
(synonyms)
'are brought in by computer manufacturer mostly' is the wordplay.
'brought in by' means one lot of letters goes inside another.
'computer manufacturer' becomes 'apple'.
'mostly' means to remove the last letter (most but not all of the word).
'apple' with its final letter removed is 'appl'.
'are' placed within 'appl' is 'APPAREL'.
(Other definitions for apparel that I've seen before include "Garb, clothes" , "Raiment" , "kit" , "costume" , "Pod of peas" .)