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The CLEAN_DEPEND intermediate was added because GNU make didn't support '::' notation, but GNU nake 3.81 (possibly earlier) does as described at
  http://www.gnu.org/software/make/manual/make.html#Double_002dColon
verified with two test makefiles
# This is 'makefile'
include ./other.mk
clean::
	@echo 1
	@echo 2
# This is 'other.mk'
CLEANALIAS = clean
${CLEANALIAS}::
	@echo 3
	@echo 4
which did what was required.

Version 5.42. Tagged as 'BuildSys-5_42'