After study, this cut (SU 615) is interpreted as relating to the construction of a hut. This set of features can be interpreted as the foundation trench and settings for upright posts that would form a hut or another small structure.
Curving linear trench with small rectangular cuts within it. Exact same situation as encountered to the north in 2010 (SU531 et al.); together those features form a semicircle and suggest a foundation trench for a hut