Crossword Genius

It's advisable to leave nothing to a dunderhead (4)

Ross

I believe the answer is:

good

'it's advisable' is the definition.
(thesaurus)

'leave nothing to a dunderhead' is the wordplay.
'leave' becomes 'go' (to go is to depart or leave).
'nothing' becomes 'O' (looks like zero - 0).
'to a dunderhead' becomes 'd' (head letter of 'dunder').
'go'+'o'+'d'='GOOD'

'to' is the link.

(Other definitions for good that I've seen before include "Enjoyable -- moral" , "and 22 Down and 14 Across: Christmas carol" , "Carol character from 1 as of old" , "promoting welfare" , "Having desirable qualities" .)

I've seen this clue in the Evening Standard.
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