Trouble working with leg over shrub
I believe the answer is:
magnolia
'shrub' is the definition.
(I've seen this before)
'trouble working with leg over' is the wordplay.
'trouble' becomes 'ail' (synonyms).
'working' becomes 'on' (on can mean working or activated).
'with' says to put letters next to each other.
'leg' becomes 'gam' (informal term for a woman's leg).
'over' is a reversal indicator.
'ail'+'on'+'gam'='ailongam'
'ailongam' in reverse letter order is 'MAGNOLIA'.
(Other definitions for magnolia that I've seen before include "Creamy colour" , "Flowering tree; light pinkish white" , "Whitish-flowered tree" , "Fragrant blooms might strangely gain loam" , "Fragrant bloom might strangely gain loam" .)