It's slow to glide round the end of the garden (5)
I believe the answer is:
snail
'it's slow' is the definition.
I can't judge whether this definition defines the answer.
'glide round the end of the garden' is the wordplay.
'glide' becomes 'sail' (I am not sure about this - if you are sure you should believe this answer much more).
'round' means one lot of letters goes inside another.
'the end of the' suggests the final letters.
The final letter of 'garden' is 'n'.
'sail' enclosing 'n' is 'SNAIL'.
'to' is the link.
Can you help me to learn more?
(Other definitions for snail that I've seen before include "Proverbially slow moving mollusc" , "Mollusc with spiral shell" , "Slow slithery mollusc" , "dawdler" , "trailer" .)