Crossword Genius

Ineffective but repaired via nail gun (10)

Ross

I believe the answer is:

unavailing

'ineffective' is the definition.
(thesaurus)

'repaired via nail gun' is the wordplay.
'repaired' indicates an anagram.
'via'+'nail'+'gun'='vianailgun'
'vianailgun' with letters rearranged gives 'UNAVAILING'.

'but' is the link.

(Another definition for unavailing that I've seen is " Achieving little or nothing".)

I've seen this clue in The Telegraph.
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