A bit of rough fun in cavalry drama (9)

I believe the answer is:

horseplay

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'a bit of rough fun' is the definition.
I can't judge whether this definition defines the answer.

'cavalry drama' is the wordplay.
'cavalry' becomes 'horse' (synonyms).
'drama' becomes 'play' (synonyms).
'horse'+'play'='HORSEPLAY'

'in' acts as a link.

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(Other definitions for horseplay that I've seen before include "Messing about (as a steed?)" , "Boisterous antics" , "Rowdy shenanigans" , "clowning around" , "High jinks" .)

I've seen this clue in The Irish News.

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