Anxiety of son on Eurostar? (6)
I believe the answer is:
strain
'anxiety' is the definition.
(thesaurus)
'son on eurostar?' is the wordplay.
I cannot quite understand how this works, but
'son' could be 's' (genealogical abbreviation for son) and 's' is found in the answer.
The remaining letters 'train' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'of' is the link.
Can you help me to learn more?
(Other definitions for strain that I've seen before include "Filter - intense effort" , "Muscle injury - tension" , "variety" , "Overtired" , "Pour through a sieve" .)