Crazy to proscribe Scottish Labour leader (7)

I believe the answer is:

bananas

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'crazy' is the definition.
(thesaurus)

'proscribe scottish labour leader' is the wordplay.
'proscribe' becomes 'ban' (banning is a kind of proscribing).
'scottish labour leader' becomes 'anas' (I can't explain this - if you can you should believe this answer much more).
'ban'+'anas'='BANANAS'

'to' acts as a link.

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(Other definitions for bananas that I've seen before include "off 27 [TROLLEY]" , "nutty" , "Crazed" , "Fruit - nuts" , "bats" .)

I've seen this clue in The Independent.

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