Flower gets lower position on the field (7)
I believe the answer is:
cowslip
'flower' is the definition.
(I've seen this before)
'lower position on the field' is the wordplay.
'lower' becomes 'cow'.
'position on the field' becomes 'slip' (I am not sure about this - if you are sure you should believe this answer much more).
'cow'+'slip'='COWSLIP'
'gets' acts as a link.
Can you help me to learn more?
(Other definitions for cowslip that I've seen before include "Wild flower of primrose family" , "Yellow flower for unsteady bovine?" , "Early spring flower" , "Flower related to primrose" , "Yellow field flower" .)