Suggest keeping nothing in apartment (5)
I believe the answer is:
float
'suggest' is the definition.
Although both the answer and definition are verbs in their base form, I don't see how they can define each other.
'nothing in apartment' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'in' means one lot of letters goes inside another.
'apartment' becomes 'flat' (synonyms).
'o' inserted within 'flat' is 'FLOAT'.
'keeping' is the link.
Can you help me to learn more?
(Other definitions for float that I've seen before include "Carnival display" , "Be buoyant" , "Levitate" , "bread supply?" , "Drift aimlessly" .)