Extended lavish picnic, perhaps? (9)
I believe the answer is:
outspread
'extended' is the definition.
(synonyms)
'lavish picnic perhaps?' is the wordplay.
I cannot really understand how this works, but
'picnic' could be 'spread' (a spread of food) and 'spread' is found in the answer.
The remaining letters 'out' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for outspread that I've seen before include "Wide apart" , "Fully extended" , "Scattered" .)