Face a diminutive couple (4)
I believe the answer is:
dial
'face' is the definition.
(face of a clock)
'a diminutive couple' is the wordplay.
I cannot really see how this works, but
'a' is found in the answer.
The remaining letters 'dil' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for dial that I've seen before include "Clock face" , "Part of old telephone" , "Calibrated face" , "feature of old phone?" , "Meter face" .)