Check phone network on! Right, one shouts approvingly (7)

I believe the answer is:

cheerer

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'one shouts approvingly' is the definition.
I can't tell whether this defines the answer.

'check phone network on right' is the wordplay.
'check' becomes 'ch' (I've seen this in other clues).
'phone network' becomes 'EE' (British mobile network EE).
'on' becomes 're' ('on' can be mean 'with reference to').
'right' becomes 'R' (common abbreviation).
'ch'+'ee'+'re'+'r'='CHEERER'

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(Another definition for cheerer that I've seen is " Raiser of spirits".)

I've seen this clue in The Telegraph.

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