Crossword Genius

Bluff sibling starts to think story is made up (8)

Ross

I believe the answer is:

consists

'is made up' is the definition.
(to consist of something is to be made up of it)

'bluff sibling starts to think story' is the wordplay.
'bluff' becomes 'con' (bluff can mean a trick or con).
'sibling' becomes 'sis' (short for sister).
'starts to' suggests taking the first letters.
The first letters of 'think story' is 'ts'.
'con'+'sis'+'ts'='CONSISTS'

(Another definition for consists that I've seen is " Comprises".)

I've seen this clue in The Guardian.
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