Poor maiden meeting bore (6)
I believe the answer is:
meagre
'poor' is the definition.
(I've seen this before)
'maiden meeting bore' is the wordplay.
'maiden' becomes 'm' (cricket abbreviation).
'meeting' is a charade indicator (letters next to each other).
'bore' becomes 'eagre' (both can mean a wave).
'm'+'eagre'='MEAGRE'
(Other definitions for meagre that I've seen before include "Paltry" , "unsatisfactorily small in amount" , "Scanty, skimpy" , "lacking in strength" , "Insufficient; scanty" .)