A little hollow (4)
I believe the answer is:
dell
'hollow' is the definition.
(dell is a kind of hollow)
'a little' is the wordplay.
I cannot quite see how this works, but
'little' could be 'l' (abbreviation for little) and 'l' is located in the answer.
The remaining letters 'del' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for dell that I've seen before include "Dingley - - , ('Pickwick Papers')" , "Deep hollow or small valley" , "Manufacturer that relies heavily on Silicon" , "Farmer's place, in song" , "Small valley; computer company" .)