BE A BETTER ANAGRAMMER XIII

The clues below can be answered by two words that are almost anagrams. That is, they differ by only a single letter - even though they may look very different from each other. For example, given the clues WAXY LIGHT SOURCE - GO UP, the answer words would be CANDLE - ASCEND - whose letters are the same except for the L in CANDLE and the S in ASCEND.

1. Male/Female - Go back on a promise
2. Deserving - Prickly, as roses
3. Protect - Portend
4. One - Eat
5. Pay attention - Losing one's mental faculties
6. Dreaded diagnosis - Move with high, springy steps
7. Formally approve - Tax
8. Period of darkness - Trace of color
9. Bird-like - Innocent and inexperienced
10. Full-grown - Sudden, serious physical injury
11. Cause a change in course - Flourish
12. Effect of something on something - Feline pleaser

Answers:

1. GENDER - RENEGE
2. WORTHY - THORNY
3. GUARD - AUGUR
4. SINGLE - INGEST
5. LISTEN - SENILE
6. CANCER - PRANCE
7. RATIFY - TARIFF
8. NIGHT - TINGE
9. AVIAN - NAIVE
10. MATURE - TRAUMA
11. DIVERT - THRIVE
12. IMPACT - CATNIP