Offer support to Barbara Stanwyck from the wings (4)

I believe the answer is:

back

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'offer support' is the definition.
'back' can be an answer for 'support' (to back is to support or endorse). I am not certain of the 'offer' bit.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for back that I've seen before include "See 12" , "Give support to; player" , "player in line of defence?" , "ago" , "Support; in return" .)

I've seen this clue in The Irish Times.

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