One philosophical about the cost of straying out of line? (5)
I believe the answer is:
stoic
'one philosophical' is the definition.
(thesaurus)
'about the cost of straying out of line?' is the wordplay.
I cannot really see how this works, but
'about' could be 'c' (abbreviation for circa) and 'c' is present in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is located in the answer.
'of' could be 'o' and 'o' is located in the answer.
The remaining letters 'si' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for stoic that I've seen before include "Athenian philosopher" , "Philosopher like Marcus Aurelius" , "Person indifferent to pleasure or pain" , "One able to endure hardship; philosopher" , "the original Zeno?" .)