Avoid crashing into trees (5)

I believe the answer is:

steer

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

'avoid' is the definition.
(thesaurus)

'crashing into trees' is the wordplay.
'trees' can be anagrammed to 'STEER'.
However, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for steer that I've seen before include "Young bull" , "Direct; young ox" , "Guide (eg, a ship)" , "Cattle - drive" , "Direct; bullock" .)

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