Birdies, pars, eagles going round few and far between (6)
I believe the answer is:
sparse
'few and far between' is the definition.
(I've seen this before)
'birdies pars eagles going round' is the wordplay.
'going round' indicates a hidden word.
'SPARSE' is hidden within 'birdies pars eagles'.
(Other definitions for sparse that I've seen before include "Not much" , "Meagre, scanty" , "Thinly-spread" , "Thin on the ground, scarce" , "In short supply" .)