Time for one area to be recalled (3)
I believe the answer is:
age
'time' is the definition.
(I've seen this before)
'for one area to be recalled' is the wordplay.
'for one' becomes 'eg' (I've seen this in other clues).
'area' becomes 'a' (maths abbreviation).
'to be recalled' shows that the letters should be reversed in order.
'eg'+'a'='ega'
'ega' written backwards gives 'AGE'.
(Other definitions for age that I've seen before include "Time in years" , "Epoch" , "Turkish commander" , "Historic period" , "Very long time" .)