U.S. Northerner’s tug at middle of the deep (6)
I believe the answer is:
yankee
'u s northerner's' is the definition.
'Yankee' can be an answer for 'northerner's' (synonyms). I'm unsure of the 'u s' bit.
'tug at middle of the deep' is the wordplay.
'tug' becomes 'yank' (I've seen this before).
'at' means one lot of letters go next to another.
'middle of' says to take the centre.
The middle letters of 'deep' are 'ee'.
'yank'+'ee'='YANKEE'
Can you help me to learn more?
(Other definitions for yankee that I've seen before include "Informal name of citizen of northern states of USA - a doodle dandy" , "One feeling sharp tug" , "Race bet; Y (radio comms)" , "Northern soldier in the US Civil War" , "What the Confederates called a 7 from the north" .)