Philip allegedly put gin with it (5)
I believe the answer is:
tonic
'gin with it' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for tonic that I've seen before include "It goes with gin" , "that may be mixed with gin" , "Key" , "Invigorating drink" , "Invigorating medicine - keynote" .)