Comic routines consisting of extremely slapdash moments (7)

I believe the answer is:

shticks

'comic routines' is the definition.
(shtick can mean a comedic routine or style)

'extremely slapdash moments' is the wordplay.
'extremely' says to hollow out the word (remove centre letters) (only the extremes of the word are used).
'moments' becomes 'ticks' (tick can mean a short moment).
'slapdash' with its middle removed is 'sh'.
'sh'+'ticks'='SHTICKS'

'consisting of' is the link.

(Another definition for shticks that I've seen is " Theatrical gimmicks".)

I've seen this clue in The Independent.

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