Makes a contribution and entrances on air (6,2)
I believe the answer is:
weighs in
'makes a contribution' is the definition.
'entrances on air' is the wordplay.
'entrances' becomes 'waysin' (an entrance is a way in).
'on air' shows a homophone (sound like) (how the word sounds on the radio, on air).
'waysin' is a homophone of 'WEIGHS IN'.
'and' is the link.
I've seen this clue in The Telegraph.
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