Train set, large circuit to make features of rock? (8,7)

I believe the answer is:

electric guitars

'features of rock?' is the definition.
(rock music features electric guitars)

'train set large circuit' is the wordplay.
'train' indicates anagramming the letters (to train can mean to grow something into a shape).
'set'+'large'+'circuit'='setlargecircuit'
'setlargecircuit' is an anagram of 'ELECTRIC GUITARS'.

'to make' is the link.

I've seen this clue in The Guardian.

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