Their only choice of club (4)

I believe the answer is:

iron

I'm a little stuck... Click here to teach me more about this clue!

'club' is the definition.
(type of golf club)

'their only choice' is the wordplay.
'IRON' is hidden within the letters.
However, I am uncertain how the hidden word is indicated.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for iron that I've seen before include "Main component of steel" , "Flatten; element" , "medicinal preparation for the anaemic?" , "Remove creases from" , "inflexible > club" .)

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

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