Opens bottle for prison guard on Spike Island? (9)
I believe the answer is:
corkscrew
'spike island?' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?
'opens bottle for prison guard' is the wordplay.
'opens bottle' becomes 'cork' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'for' means one lot of letters go next to another.
'prison guard' becomes 'screw' (synonyms).
'cork'+'screw'='CORKSCREW'
'on' acts as a link.
Can you help me to learn more?
(Other definitions for corkscrew that I've seen before include "Spiral device for wine lovers" , "This might help one who gets in the drink" , "Bottle-opener" , "handy opener" , "Device used to get at red" .)