My pet might be hungry (5)
I believe the answer is:
empty
'hungry' is the definition.
(similar in meaning)
'my pet might be' is the wordplay.
'might be' indicates anagramming the letters.
'my'+'pet'='mypet'
'mypet' with letters rearranged gives 'EMPTY'.
(Other definitions for empty that I've seen before include "Loneliness parents feel when their children leave home" , "Dead man" , "vain" , "Hollow or vacant" , "Like the sherry decanter by the time gran's jolly" .)