Crossword Genius

Inflexible hold on a club? (4,4)

Ross

I believe the answer is:

iron grip

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'inflexible' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'hold on a club?' is the wordplay.
'hold' becomes 'grip' (synonyms).
'on' is a charade indicator (letters next to each other).
'a club?' becomes 'iron' (type of golf club).
'grip' after 'iron' is 'IRON GRIP'.

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I've seen this clue in The Globe and Mail.
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