Very grateful for any help with these three clues please.
5dn: "Did tart pine to be given diamonds?" (7). I have S-R-C--.
7dn: "Closed grill: measure used for heat retention." (3,6). I have T-G, -A---G.
48dn: "Brother in N England in past seen with stick." (2,3). I have B-,G-M.