Crazy type, one gathering fruit from trees? (6)

I believe the answer is:

nutter

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'fruit from trees?' is the definition.
The definition suggests a singular noun which matches the answer.

'crazy type one gathering' is the wordplay.
'crazy type' becomes 'nut'.
'one gathering' becomes 'ter' (I can't justify this - if you can you should give a lot more credence to this answer).
'nut'+'ter'='NUTTER'

Can you help me to learn more?

(Other definitions for nutter that I've seen before include "Idiot" , "Lunatic (sl.)" , "who head-butts one" , "fruitcake" , "psychopath" .)

I've seen this clue in The Times.

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