What might be raised, say, in seconds, that is (5)
I believe the answer is:
siege
'what might be raised' is the definition.
I can't judge whether this definition defines the answer.
'say in seconds that is' is the wordplay.
'say' becomes 'eg' (both can mean 'for example').
'in' means one lot of letters goes inside another.
'seconds' becomes 's'.
'that is' becomes 'ie' (short for Latin 'id est', 'that is').
's'+'ie'='sie'
'eg' going within 'sie' is 'SIEGE'.
Can you help me to learn more?
(Other definitions for siege that I've seen before include "Military operation ringing a town" , "Military blockade" , "Offence in which fortified place is surrounded" , "Military operation cutting off access" , "Military operation to seal off (town)" .)