Build up a team, by the sound of it (6)
I believe the answer is:
accrue
'build up' is the definition.
(I've seen this in another clue)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for accrue that I've seen before include "Gather" , "Accumulate or amass like interest" , "(Of money) be received in increasing amounts" , "Show increasing interest" , "Accumulate over time" .)