Dig tunnel badly, revealing some tolerance (9)

I believe the answer is:

indulgent

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'dig tunnel badly revealing some tolerance' is the definition.
I can't tell whether this definition defines the answer.

'dig tunnel badly' is the wordplay.
'badly' indicates anagramming the letters (letters in the wrong order).
'dig'+'tunnel'='digtunnel'
'digtunnel' anagrammed gives 'INDULGENT'.

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(Other definitions for indulgent that I've seen before include "Too tolerant or generous" , "passing over faults" , "Ready to overlook faults" , "Tolerant, lenient" , "ending to spoil" .)

I've seen this clue in The Times.

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