Running rife on the meadow, is producing more foliage (7)
I believe the answer is:
leafier
'more foliage' is the definition.
(I've seen this before)
'running rife on the meadow' is the wordplay.
'running' is an anagram indicator (the letters run around to different places).
'on' is an insertion indicator (as in clothing 'on' a person).
'the meadow' becomes 'lea' (a lea is a grassy area).
'rife' with letters rearranged gives 'fier'.
'fier' going around 'lea' is 'LEAFIER'.
'is producing' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for leafier that I've seen before include "more rural" , "more green" , "sort of suburb" , "Having more foliage" .)