Crossword Genius

Poor shot selection at start splits Mark's supporters in opening frame (9)

Ross

I believe the answer is:

doorposts

'supporters in opening frame' is the definition.

'poor shot selection at start splits mark's' is the wordplay.
'shot' indicates anagramming the letters.
'at start' says to take the initial letters.
'splits' is an insertion indicator.
'mark's' becomes 'dots'.
The initial letter of 'selection' is 's'.
'poor' anagrammed gives 'orpo'.
'orpo'+'s'='orpos'
'orpos' placed inside 'dots' is 'DOORPOSTS'.

(Another definition for doorposts that I've seen is " Supports".)

I've seen this clue in The Guardian.
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