Possibly, as a root system lies around our ground (7)
I believe the answer is:
fibrous
'possibly as a root system' is the definition.
(containing or resembling fibres)
'lies around our ground' is the wordplay.
'lies' becomes 'fibs' (fibbing is a kind of lying).
'around' is an insertion indicator.
'ground' indicates an anagram ('grind' the letters into a new form).
'our' with letters rearranged gives 'rou'.
'fibs' placed around 'rou' is 'FIBROUS'.
(Other definitions for fibrous that I've seen before include "Of, or containing, filaments" , "Offering lots of roughage" , "Like roughage" , "Stringy" .)