Heads of lettuce in Oriental stew (4)

I believe the answer is:

olio

'stew' is the definition.
(I've seen this in another clue)

'heads of lettuce in oriental' is the wordplay.
'heads' suggests taking the first letters.
The first letters of 'of lettuce in oriental' is 'OLIO'.

(Other definitions for olio that I've seen before include "Savoury dish of different types of meat and vegetable" , "Collection of miscellany" , "Variety" , "Mixture" .)

I've seen this clue in The Irish Times.

Want a hint initially instead of a full solution? Install my app