Would appreciate help with final clues.
27a. Mate drone follows around.(4) I have ???M
33a. Compact period of casual interest.(8) I have ???I?N??
30d. Exploit river delta.(4) I have D???
Alliance fits better.
Alliance is a compact or treaty between thos with a common interest.
Dalliance shortened by one letter (therefore compact in the sense of squeezed) is also alliance.