Crossword Genius

Upset at charges? Get in free! (9)

Ross

I believe the answer is:

gatecrash

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'in free' is the definition.
Although both the answer and definition are verbs in their base form, I don't see how they can define each other.

'upset at charges?' is the wordplay.
'upset' indicates an anagram.
'at'+'charges'='atcharges'
'atcharges' anagrammed gives 'GATECRASH'.

'get' acts as a link.

Can you help me to learn more?

(Other definitions for gatecrash that I've seen before include "join party if not wanted" , "to do so uninvited" , "Try to get in for free" , "join party unofficially" , "enter without invitation" .)

I've seen this clue in The Times and The Sun.
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