Upright Scot possibly out to be calm and unemotional (5)
I believe the answer is:
stoic
'unemotional' is the definition.
(similar in meaning)
'upright scot possibly out' is the wordplay.
'upright' becomes 'i' (I can't justify this - if you can you should believe this answer much more).
'possibly' indicates an anagram.
'out' indicates putting letters inside.
'scot' is an anagram of 'stoc'.
'i' inserted inside 'stoc' is 'STOIC'.
'to be calm and' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for stoic that I've seen before include "Ancient philosopher" , "One who endures pain with equanimity" , "Able to endure pain" , "Unflappable type" , "Impassive type" .)