One nurse forced to seek cover (6)
I believe the answer is:
insure
'cover' is the definition.
(synonyms)
'one nurse forced' is the wordplay.
'one' becomes 'i' (Roman numeral).
'forced' is an anagram indicator.
'nurse' is an anagram of 'nsure'.
'i'+'nsure'='INSURE'
'to seek' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for insure that I've seen before include "Take out cover" , "Make certain" , "Protect (something) against loss" , "Rue sin (anag)" , "Protect by taking out a policy" .)