For instance, going round Germany Yankee becomes tense (4)
I believe the answer is:
edgy
'tense' is the definition.
(similar in meaning)
'for instance going round germany yankee' is the wordplay.
'for instance' becomes 'eg' (short for 'exempli gratia', 'for example' in Latin).
'going round' is an insertion indicator (some letters go around others).
'germany' becomes 'd' (vehicle registration code for Deutschland).
'yankee' becomes 'Y' (phonetic alphabet: alpha, bravo, charlie etc.).
'eg' enclosing 'd' is 'edg'.
'edg'+'y'='EDGY'
'becomes' acts as a link.
(Other definitions for edgy that I've seen before include "Visibly nervous" , "In a tense state" , "Extremely" , "Nervous and tense, irritable" , "Keyed up" .)