Philosophical about the calamitous cost when one is taken in (5)
I believe the answer is:
stoic
'philosophical' is the definition.
(thesaurus)
'the calamitous cost when one is taken in' is the wordplay.
'the calamitous' indicates an anagram.
'when one' becomes 'i' (Roman numeral. I am not sure about the 'when' bit.).
'is taken in' means one lot of letters goes inside another.
'cost' anagrammed gives 'stoc'.
'stoc' enclosing 'i' is 'STOIC'.
'about' is the link.
Can you help me to learn more?
(Other definitions for stoic that I've seen before include "Greek philosopher" , "Unflappable type" , "the original Zeno?" , "Seeming unaffected by pleasure or pain" , "Long-suffering type; follower of Zeno" .)