Thought Picaroon gives people a hand, briefly (4)
I believe the answer is:
idea
'thought picaroon' is the definition.
'idea' can be an answer for 'thought' (I've seen this in another clue). I'm not certain of the 'picaroon' bit.
'gives people a hand briefly' is the wordplay.
'gives people' becomes 'i' (I can't justify this - if you can you should believe this answer much more).
'a hand' becomes 'deal' ('deal' can be a synonym of 'hand').
'briefly' means to remove the last letter.
'deal' with its last letter removed is 'dea'.
'i'+'dea'='IDEA'
(Other definitions for idea that I've seen before include "Theory" , "It comes to mind" , "Notion in the mind" , "Creative spark" , "Thought or notion (4)" .)