Composer Carl runs into elsewhere (4)
I believe the answer is:
orff
'composer carl' is the definition.
(I've seen this in another clue)
'runs into elsewhere' is the wordplay.
'runs' becomes 'r' (cricket abbreviation).
'into' means one lot of letters goes inside another.
'elsewhere' becomes 'off' (eg someone off of work is elsewhere).
'r' going within 'off' is 'ORFF'.
(Other definitions for orff that I've seen before include "Carl -, wrote Carmina Burana" , "Composer of Carmina Burana, d. 1982" , "With all instruments" , "German who scored" , "Rowing boat" .)