Girl on call not letting it get her down (7,2)

I believe the answer is:

bearing up

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'letting it get her down' is the definition.
I can't tell whether this defines the answer.

'girl on call' is the wordplay.
'girl' becomes 'bea' ().
'on' is a charade indicator (letters next to each other) (in a down clue, letters appear on others).
'call' becomes 'ring up' (call on the phone).
'bea'+'ringup'='BEARING UP'

'not' acts as a link.

Can you help me to learn more?

(Another definition for bearing up that I've seen is " being brave under the circumstances".)

I've seen this clue in The Daily Express.

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