Revised a term for "mother" (5)
I believe the answer is:
mater
'mother' is the definition.
(old-fashioned term for mother)
'revised a term' is the wordplay.
'revised' indicates anagramming the letters.
'a'+'term'='aterm'
'aterm' anagrammed gives 'MATER'.
'for' acts as a link.
(Other definitions for mater that I've seen before include "Mum" , "having children" , "Mother (sl.)" , "mum's the word" , "Mother (Latin or old slang)" .)