Custom starts to bore, elder said (7)

I believe the answer is:

bespoke

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'custom' is the definition.
(synonyms)

'starts to bore elder said' is the wordplay.
'starts to' suggests taking the first letters.
'said' becomes 'spoke' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
The first letters of 'bore elder' is 'be'.
'be'+'spoke'='BESPOKE'

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(Other definitions for bespoke that I've seen before include "Tailor-made" , "Description of tailor" , "Of clothes, made to order" , "Made to measure" , "Custom-made" .)

I've seen this clue in The Daily Express.

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