Answered by Shaykh Faraz Rabbani
If one believes that the present prayer be missed one performs mandatory ghusl, can he simply perform a quick wudu and waive the mandatory performance of ghusl until after he has prayed?
Answer:
No, one couldn’t limit oneself to wudu or even dry ablutions (tayammum) in such a case. [al-Hadiyya al-`Ala’iyya]
It would remain obligatory to perform ghusl and pray, even if outside the time. After prayer, one should seek forgiveness for one’s error, or for that which led to it.
Walaikum assalam,
Faraz Rabbani.