Singer seen and heard performing (2,7)

I believe the answer is:

ed sheeran

'singer' is the definition.
(British musician)

'seen and heard performing' is the wordplay.
'and' means one lot of letters go next to another.
'performing' is an anagram indicator.
'seen' put after 'heard' is 'heardseen'.
'heardseen' with letters rearranged gives 'ED SHEERAN'.

(Another definition for ed sheeran that I've seen is " Musician".)

I've seen this clue in The Telegraph.

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