Broadcaster crosses barrier, becoming a drinker? (9)

I believe the answer is:

swallower

'a drinker?' is the definition.
(someone swallowing a drink)

'broadcaster crosses barrier' is the wordplay.
'broadcaster' becomes 'sower' (I've seen this before).
'crosses' means one lot of letters goes inside another.
'barrier' becomes 'wall' (I've seen this before).
'sower' going around 'wall' is 'SWALLOWER'.

'becoming' acts as a link.

(Another definition for swallower that I've seen is " See 18".)

I've seen this clue in The Guardian.

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