Anxiety for school transport down the line (6)
I believe the answer is:
strain
'anxiety' is the definition.
(thesaurus)
'school transport down the line' is the wordplay.
'school transport down' becomes 's' (I am not sure about this - if you are sure you should believe this answer much more).
'the line' becomes 'train' (train is a kind of line).
's'+'train'='STRAIN'
'for' is the link.
Can you help me to learn more?
(Other definitions for strain that I've seen before include "Wrench; melody" , "Mental tension, stress" , "Weaken -- sieve" , "Distinct breed; use a seive" , "Tension and exertion" .)