A half dead stallion has a certain need (6)

I believe the answer is:
desire
'a certain need' is the definition.
'desire' can be an answer for 'need' (I have seen 'Strong need ' mean 'desire' so perhaps 'need' could also mean 'desire'). I'm not certain of the 'a certain' bit.
'a half dead stallion' is the wordplay.
'a half' suggests halving the letters.
'stallion' becomes 'sire' (I am not sure about this - if you are sure you should believe this answer much more).
'dead' with half the letters taken is 'de'.
'de'+'sire'='DESIRE'
'has' acts as a link.
Can you help me to learn more?
(Other definitions for desire that I've seen before include "Longing or wish" , "Hanker after" , "Reside (anag.)" , "Strong need" , "Want, wish for" .)
