Crossword Genius

Worry, seeing gee-gee entering river (6)

Ross

I believe the answer is:

niggle

'worry' is the definition.
(niggling is a kind of worrying)

'gee-gee entering river' is the wordplay.
'gee' becomes 'g' ('g' can be a synonym of 'gee').
'gee' becomes 'g' ('g' can be a synonym of 'gee').
'entering' indicates putting letters inside.
'river' becomes 'nile' (Nile is an example).
'g'+'g'='gg'
'gg' going within 'nile' is 'NIGGLE'.

'seeing' is the link.

(Other definitions for niggle that I've seen before include "Grumble" , "Persistant annoyance" , "Persistently criticise over trifles" , "Carp" , "Annoy slightly" .)

I've seen this clue in The Telegraph.
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