Competition adapted garden gnome's cap, making end of pompom round (3-3-5,4)
I believe the answer is:
egg-and-spoon race
'end of pompom round' is the definition.
The definition suggests a singular noun which matches the answer.
'competition adapted garden gnome's cap' is the wordplay.
I cannot quite see how this works, but
'competition' could be 'race' (race is a kind of competition) and 'race' is found within the answer.
The remaining letters 'eggandspoon' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'making' is the link.
Can you help me to learn more?
(Another definition for egg-and-spoon race that I've seen is " Handicapped running contest".)