GBH is an unusual form of assault (7)

I believe the answer is:

bashing

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'gbh is an unusual form of assault' is the definition.
I can't tell whether this definition defines the answer.

'gbh is an unusual form' is the wordplay.
'unusual form' indicates an anagram (I've seen this in other clues).
'gbh'+'is'+'an'='gbhisan'
'gbhisan' with letters rearranged gives 'BASHING'.

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(Another definition for bashing that I've seen is " Violently striking; severely criticising".)

I've seen this clue in The Irish Times.

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