No margin to avoid lethality in Lounge (4)
I believe the answer is:
idle
'in lounge' is the definition.
(I've seen this before)
'no margin to avoid lethality' is the wordplay.
'no' becomes 'love' (love is zero in tennis).
'margin' suggests removing the centre (I've seen 'margins' mean this (the letters on the margins are used)).
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'avoid lethality' becomes 'id' (I can't explain this - if you can you should believe this answer much more).
'love' with its middle removed is 'le'.
'le' after 'id' is 'IDLE'.
Can you help me to learn more?
(Other definitions for idle that I've seen before include "Avoiding work, lazy" , "Monty Python's Eric, b. 1943" , "without basis" , "lndolent" , "not working in > lounge" .)