Computer program modified real clothing (7)
I believe the answer is:
apparel
'clothing' is the definition.
(I know that clothing can be written as apparel)
'computer program modified real' is the wordplay.
'computer program' becomes 'app'.
'modified' indicates anagramming the letters.
'real' with letters rearranged gives 'arel'.
'app'+'arel'='APPAREL'
(Other definitions for apparel that I've seen before include "what's in the press?" , "Clothing, things to wear" , "whatever people have on" , "Pod of peas" , "Clothes - garments" .)