Don of gardening framing cover of horticultural magazine? (7)
I believe the answer is:
monthly
'magazine?' is the definition.
(thesaurus)
'don of gardening framing cover of horticultural' is the wordplay.
'don of gardening' becomes 'monty' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'framing' means one lot of letters goes inside another (inserted letters are framed by the outside letters).
'cover of' says to hollow out the word (remove centre letters) (only the letters which cover the word).
'horticultural' with its middle taken out is 'hl'.
'monty' going around 'hl' is 'MONTHLY'.
Can you help me to learn more?
(Another definition for monthly that I've seen is " Twelve times a year".)