Don’t get up right away as Light Infantry and earl entered? (3,2)
I believe the answer is:
'don't' is the definition.
Both the definition and answer are verbs in their base form.
Perhaps you can see a link between them that I can't see?
'up right away as light infantry and earl entered?' is the wordplay.
'up right away as light infantry' becomes 'lii' (I can't justify this - if you can you should believe this answer much more).
'and' becomes 'n' (common abbreviation for 'and').
'earl' becomes 'e'.
'entered?' indicates putting letters inside.
'liin' placed around 'e' is 'LIE-IN'.
'get' acts as a link.
Can you help me to learn more?
(Other definitions for lie in that I've seen before include "An extra spell in bed" , "rest of the morning" , "delay rise" , "Extra time in bed in the morning" , "Prolonged bed rest" .)