Crossword Genius

Watching old boy waiting (9)

Ross

I believe the answer is:

observing

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

'watching' is the definition.
(observing is a kind of watching)

'old boy waiting' is the wordplay.
'old boy' becomes 'OB' (abbreviation for a private school 'old boy').
'waiting' becomes 'serving' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'ob'+'serving'='OBSERVING'

Can you help me to learn more?

(Other definitions for observing that I've seen before include "Taking note of" , "Watching and perhaps taking notes" , "Looking at" , "Watching attentively" , "Noticing or perceiving" .)

I've seen this clue in The Telegraph.
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