Immature bowlers here? (5)
I believe the answer is:
green
This clue is a double definition.
'immature' is the first definition.
(I know that immature can be written as green)
'bowlers here?' is the second definition.
(I've seen this before)
(Other definitions for green that I've seen before include "Consultative document" , "Ecologically correct" , "Proverbial constituent of our moon" , "driver may go on it" , "Between blue and yellow in the colour spectrum" .)