Method initially introduced to get free ticket (4)

I believe the answer is:

comp

'free ticket' is the definition.
(a complimentary ticket)

'method initially introduced to get' is the wordplay.
'initially' indicates taking the first letters.
'introduced to' means one lot of letters goes inside another.
'get' becomes 'cop' (I've seen this before).
The first letter of 'method' is 'm'.
'm' inserted into 'cop' is 'COMP'.

I've seen this clue in The Times.

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