Crossword Genius

Emergency treatment to make tree steady (5,3)

Ross

I believe the answer is:

first aid

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

'emergency treatment' is the definition.
(I've seen this in another clue)

'tree steady' is the wordplay.
'tree' becomes 'fir' (fir tree is a kind of tree).
'steady' becomes 'staid' (I am not sure about this - if you are sure you should believe this answer much more).
'fir'+'staid'='FIRST-AID'

'to make' acts as a link.

Can you help me to learn more?

(Other definitions for first aid that I've seen before include "Immediate help for the sick or injured" , "Basic medical help" , "Immediate treatment for the wounded" , "dressing" , "Emergency procedure" .)

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