Try hard to get the five tries converted (6)
I believe the answer is:
Here is my best explanation:
'try hard' is the definition.
(I've seen this before)
'get the five tries converted' is the subsidiary indication.
'get' means one lot of letters go next to another.
'the five' becomes 'v' ('V' can be a synonym of 'five').
'converted' is an anagram indicator.
'v' put next to '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", "Rivets (anag)", "Make effort using rivets", "Venture", "Labour, try hard" and "Try hard to break rivets".)