It's apt to be turned (3)

I believe the answer is:

tap

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'it's' is the definition.
I can't tell whether this defines the answer.

'apt to be turned' is the wordplay.
'to be turned' is an anagram indicator.
'apt' with letters rearranged gives 'TAP'.

Can you help me to learn more?

(Other definitions for tap that I've seen before include "water supply" , "Somewhere to drink beer" , "Sort of dance" , "Gentle stroke" , "Water controller" .)

I've seen this clue in the Evening Standard.

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