Always back on beat girl (5)

I believe the answer is:

tanya

'girl' is the definition.

'always back on beat' is the wordplay.
'always' becomes 'ay' (archaic term for 'always').
'back' is a reversal indicator.
'on' means one lot of letters go next to another.
'beat' becomes 'tan' (tan can mean to beat or hit).
'ay' written backwards gives 'ya'.
'ya' put after 'tan' is 'TANYA'.

(Another definition for tanya that I've seen is " Russian girl".)

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

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