Shows concern over son's pet (6)

I believe the answer is:

caress

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'pet' is the definition.
(thesaurus)

'shows concern over son's' is the wordplay.
'shows' becomes 's' (this could be a standard abbreviation of which I'm unaware).
'concern' becomes 'care' ('care' can be a synonym of 'concern').
'over' is a charade indicator (letters next to each other).
's' put after 'care' is 'cares'.
'cares'+'s'='CARESS'

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(Other definitions for caress that I've seen before include "Tenderly stroke" , "Scares with loving stroke" , "Scares into handle lovingly" , "Stroke affectionately" , "Stroke, fondle" .)

I've seen this clue in The Telegraph.

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