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Make blue record in costume (7) D---E--
In due course caller ordered large energy converter 5/4. -O--R -E-L

Make blue is Depress
Dress (costume) round EP (Extentended Play record if you're too young to remember them!)

second one solar cell

anagram of caller + S

sorry that should be anagram of caller + L + S

ROSALIND and CHRISG - thank you both very much. By the way Rosalind - no I'm not too young to remember EP ! but when I read the clue this old mind immediately leapt to LP (long play) and I couldn't shift this from my thinking so 1 out of 10 for old knowledge and 9 out of 10 for inflexibility.