Large individual, one in Bonn, prolonged stay in bed
I believe the answer is:
liein
'stay in bed' is the definition.
(I've seen this before)
'large individual one in bonn' is the wordplay.
'large' becomes 'L' (eg in clothes sizes).
'individual' becomes 'i' (Roman numeral for one).
'one in bonn' becomes 'ein' (I've seen this in another clue).
'l'+'i'+'ein'='LIE-IN'
'prolonged' acts as a link.
I am not very happy about this link. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for liein that I've seen before include "Prolonged bedtime" , "Prolonged rest" , "be dormant" .)