Old solver's got the setter a little shrub! (5)
I believe the answer is:
thyme
'a little shrub' is the definition.
'thyme' can be an answer for 'shrub' (I've seen this before). I am not sure about the 'a little' bit.
'old solver's got the setter' is the wordplay.
'old solver' becomes 'thy' (I've seen this in other clues. I am not sure about the 'old' bit.**).
'got' is a charade indicator (letters next to each other).
'the setter' becomes 'me' (the setter of the clue).
'thy'+'me'='THYME'
Can you help me to learn more?
(Other definitions for thyme that I've seen before include "Culinary herb of the mint family" , "Seasoning plant" , "Flavouring" , "Aromatic culinary herb; sounds like occasion" , "Ingredient in cooking" .)