Knowledgeable person at university cutting grass area for dragonflies (7)

'knowledgeable person at university cutting grass area for dragonflies' is the definition.
I can't tell whether this definition defines the answer.

'knowledgeable person at university cutting grass area' is the wordplay.
'knowledgeable person at university' becomes 'don' (don can mean an academic).
'cutting' means one lot of letters goes inside another (some letters cut their way into a word).
'grass' becomes 'oat' (oat is a type of grass).
'area' becomes 'a' (maths abbreviation).
'don' going into 'oat' is 'odonat'.
'odonat'+'a'='ODONATA'

Can you help me to learn more?