When abroad, you may find these dear children abandoned by nanny? (7,7)

I believe the answer is:

roaming charges

'when abroad you may find these' is the definition.
(charges for using your phone abroad)

'dear children abandoned by nanny?' is the wordplay.
I cannot really see how this works, but
'children' could be 'ch' (genealogical abbreviation) and 'ch' is found within the answer.
This explanation may well be incorrect...

I've seen this clue in The Times.

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