Beast Romeo meets husband in love (5)
I believe the answer is:
rhino
'beast' is the definition.
(I've seen this before)
'romeo meets husband in love' is the wordplay.
'romeo' becomes 'R' (phonetic alphabet: alpha, bravo, charlie etc.).
'meets' says to put letters next to each other.
'husband' becomes 'h'.
'love' becomes 'o' (love means zero in tennis).
'r'+'h'+'in'+'o'='RHINO'
(Other definitions for rhino that I've seen before include "Horned ungulate" , "In brief, large thick-skinned animal of Africa" , "wild beast" , "Moola" , "One charging" .)