Without love, this supporter may be lost (5)
I believe the answer is:
stool
'without love this supporter may be lost' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'without love this supporter may be lost' is the wordplay.
'without' indicates putting letters inside.
'love this supporter' becomes 'o' (I can't explain this - if you can you should give a lot more credence to this answer).
'may' is an anagram indicator (I've seen 'might' mean this (I've seen this in other clues)).
'lost' with letters rearranged gives 'stol'.
'o' put inside 'stol' is 'STOOL'.
Can you help me to learn more?
(Other definitions for stool that I've seen before include "item of furniture here" , "Small seat" , "Motion" , "Backless chair" , "Three-legged backless seat" .)