Crossword Genius

Watch phosphorus leak out (4)

Ross

I believe the answer is:

seep

'leak out' is the definition.
(I've seen this in another clue)

'watch phosphorus' is the wordplay.
'watch' becomes 'see' (seeing is a kind of watching).
'phosphorus' becomes 'P' (P is the chemical symbol for phosphorus).
'see'+'p'='SEEP'

(Other definitions for seep that I've seen before include "Flow or leak slowly" , "Leak slowly, ooze" , "Come out slowly" , "Ooze, percolate" , "Leak through an opening" .)

I've seen this clue in The Sun.
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