Remain in good health after end of Covid (5)
I believe the answer is:
dwell
'remain' is the definition.
(I've seen this before)
'in good health after end of covid' is the wordplay.
'in good health' becomes 'well' (similar in meaning).
'after' is a charade indicator (letters next to each other).
'end of' indicates one should take the final letters.
The final letter of 'covid' is 'd'.
'well' after 'd' is 'DWELL'.
(Other definitions for dwell that I've seen before include "Reside - linger" , "Remain" , "stay" , "Settle" , "Lodge" .)