Crossword Genius

Possible barrier to free movement? (4)

Ross

I believe the answer is:

reef

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

'possible barrier' is the definition.
'reef' can be an answer for 'barrier' (I have seen 'Submerged barrier' mean 'reef' so perhaps 'barrier' could also mean 'reef'). I am not certain of the 'possible' bit.

'free movement?' is the wordplay.
'movement?' is an anagram indicator (I've seen 'movement' mean this).
'free' anagrammed gives 'REEF'.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for reef that I've seen before include "Rock near water's surface" , "Shorten sail" , "Rock formed of coral" , "Ridge of coral near the sea surface" , "Coral-ridge" .)

I've seen this clue in the Evening Standard.
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