I'm not sure highly colourful clothes will be for the general public (8)

I believe the answer is:

exoteric

'for the general public' is the definition.
(the opposite of esoteric)

'i'm not sure highly colourful clothes' is the wordplay.
'i'm not sure' becomes 'er' (expression of hesitation).
'highly colourful' becomes 'exotic'.
'clothes' indicates putting letters inside.
'er' put within 'exotic' is 'EXOTERIC'.

'will be' is the link.

(Another definition for exoteric that I've seen is " ordinary".)

I've seen this clue in The Times.

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