Have an ambition of rents rising in emergency accommodation (6)
I believe the answer is:
aspire
'have an ambition' is the definition.
(I've seen this before)
'rents rising in emergency accommodation' is the wordplay.
'rents' becomes 'rips' ('rip' can be a synonym of 'rent').
'rising' says the letters should be written in reverse (in a down clue, letters go up).
'in' indicates putting letters inside.
'emergency accommodation' becomes 'ae' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'rips' written backwards gives 'spir'.
'spir' placed inside 'ae' is 'ASPIRE'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for aspire that I've seen before include "Have lofty aims" , "Set your sights on" , "Aim (for higher things)" , "Aim, have an ambitious plan" , "Wish to rise (to)" .)