Put on an extra court for heroin user, say (6)
I believe the answer is:
addict
'heroin user say' is the definition.
(someone addicted to heroin)
'put on an extra court' is the wordplay.
'put on' becomes 'add' (I've seen this before).
'an' becomes 'i' (Roman numeral for one).
'extra court' becomes 'ct' (I am not sure about the 'extra' bit.).
'add'+'i'+'ct'='ADDICT'
'for' is the link.
Can you help me to learn more?
(Other definitions for addict that I've seen before include "Person given to abusing drugs" , "Person who is physiologically dependent on a substance" , "Make dependent" , "One unable to kick habit" , "Devotee: user" .)