Some new ideas — comprehensive (4)
I believe the answer is:
wide
'comprehensive' is the definition.
(associated in meaning)
'some new ideas' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'WIDE' is hidden within 'new ideas'.
(Other definitions for wide that I've seen before include "Broad - extra" , "roomy" , "Extensive" , "(At cricket) an extra" , "shrewd and shifty" .)