Try hard to get the five tries converted (6)
I believe the answer is:
strive
'try hard' is the definition.
(I've seen this before)
'get the five tries converted' is the wordplay.
'get' means one lot of letters go next to another.
'the five' becomes 'V' (Roman numeral).
'converted' indicates an anagram.
'v'+'tries' is 'vtries'.
'vtries' with letters rearranged gives 'STRIVE'.
'to' is the link.
(Other definitions for strive that I've seen before include "Building propped against the wall of another" , "Work hard - compete" , "Try extremely hard" , "Make a great effort" , "Exert much effort" .)