How might transvestite go over a frock? (5-5)

I believe the answer is:

cross-dress

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'how might transvestite' is the definition.
I can't judge whether this definition defines the answer.

'go over a frock?' is the wordplay.
'go over' becomes 'cross' (to cross over).
'a frock?' becomes 'dress' ('dress' can be a synonym of 'frock').
'cross'+'dress'='CROSS-DRESS'

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(Another definition for cross-dress that I've seen is " Wear clothing typical of the opposite sex".)

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

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