Crossword Genius

Tree sprouting bananas in lobby, perhaps (8,5)

Ross

I believe the answer is:

interest group

'lobby perhaps' is the definition.
(I know that advocacy group is a type of interest group)

'tree sprouting bananas' is the wordplay.
'bananas' indicates an anagram (informal term for mad).
'tree'+'sprouting'='treesprouting'
'treesprouting' anagrammed gives 'INTEREST GROUP'.

'in' acts as a link.

(Another definition for interest group that I've seen is " Set working with a common aim".)

I've seen this clue in The Telegraph.
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