Broken horn is a disadvantage for these animals (6)

I believe the answer is:

rhinos

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'a disadvantage for these animals' is the definition.
The definition suggests an adverb but the answer is not.

'broken horn is' is the wordplay.
'broken' is an anagram indicator.
'horn'+'is'='hornis'
'hornis' is an anagram of 'RHINOS'.

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(Other definitions for rhinos that I've seen before include "Massive mammals with one or two horns, in short" , "Horned mammals" .)

I've seen this clue in The Irish Times.

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