Crossword Genius

Unused open fire permit (6)

Ross

I believe the answer is:

fallow

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'unused' is the definition.
Both the answer and definition are adjectives. Perhaps there's a link between them I don't understand?

'open fire permit' is the wordplay.
'open' suggests taking the first letters (take the opening letter).
'permit' becomes 'allow' (synonyms).
The first letter of 'fire' is 'f'.
'f'+'allow'='FALLOW'

Can you help me to learn more?

(Other definitions for fallow that I've seen before include "(Of fields) left unsown" , "Left unploughed and unseeded" , "(Of land) left unsown" , "Inactive" , "idle" .)

I've seen this clue in the Sydney Morning Herald.
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