Crossword Genius

Tree overlooking street and tops of neighbourhood including a maze? (8)

Ross

I believe the answer is:

astonish

I'm a little stuck... Click here to teach me more about this clue!

'tree' is the definition.
Although both the answer and definition are verbs in their base form, I cannot understand how they can define each other.

'overlooking street and tops of neighbourhood including a maze?' is the wordplay.
I cannot quite see how this works, but
'street' could be 'st' and 'st' is present in the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is found in the answer.
'of' could be 'o' and 'o' is found within the answer.
'a' is present in the answer.
The remaining letters 'ish' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for astonish that I've seen before include "Gobsmack" , "Flabbergast" , "Stagger" , "Stun" , "Confound" .)

I've seen this clue in the Irish Times.
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