Middle of June concert — I perform number with little hope of success (11)

I believe the answer is:

unpromising

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'number with little hope of success' is the definition.
I can't judge whether this definition defines the answer.

'middle of june concert i perform' is the wordplay.
'middle of' says to take the centre.
'concert' becomes 'prom' (abbreviation for promenade concert).
'perform' becomes 'sing' (to perform a song).
The central letters of 'june' are 'un'.
'un'+'prom'+'i'+'sing'='UNPROMISING'

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(Other definitions for unpromising that I've seen before include "with a dismal prospect" , "Not looking hopeful" .)

I've seen this clue in The Times.

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