Crossword Genius

Firm flying out in case (9)

Ross

I believe the answer is:

tenacious

'firm' is the definition.
(thesaurus)

'flying out in case' is the wordplay.
'flying' indicates an anagram.
'out'+'in'+'case'='outincase'
'outincase' anagrammed gives 'TENACIOUS'.

(Other definitions for tenacious that I've seen before include "Holding or sticking firmly" , "Holding fast" , "Keeping a firm hold" , "Persevering" , "refusing to give up" .)

I've seen this clue in The Telegraph.
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